--- a/mozilla/toolkit/crashreporter/google-breakpad/src/common/linux/elf_core_dump.h
+++ b/mozilla/toolkit/crashreporter/google-breakpad/src/common/linux/elf_core_dump.h
@@ -36,6 +36,7 @@
 #include <elf.h>
 #include <link.h>
 #include <stddef.h>
+#include <sys/reg.h>
 
 #include "common/memory_range.h"
 
